Hi I’m hoping to get some advice on what to do next.I have a 2009 Galant with code p0431 and p0421. I have replaced the catalytic converter with an aftermarket and all O2 with OEM Denso sensors . As I road tested the check engine light came on and the codes are the same. Is it possible I did something wrong? Any advice is appreciated.

 

If you have ecuflash give the bin file , to solve this problem , am already found the solution